Sponge underlay: Material: Non-polluted environmental sponge Density: 80-150kg/m3 Thickness: 3mm and up Width: 1m-1.37m Length: 11-27m/roll Surface backing (coating) material: 1.PE foil 2.Non-woven fabric 3.Papers 4.Alu foil 5. Others Packing: roll packing with plastic bag